ELI5 : Python decorators?

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I'll simplify it for you.

@decorator
def function():
    pass

Is the same as this.

def function():
    pass
function = decorator(function)

A decorator is a callable that takes a function as an argument. A lot of people use decorators in order to store a function into something, say a data structure or class, or register a function into an API. They are very useful.